<!-- 封装VanFieldCheckbox多选组件 -->
<template>
  <div class="dh-field ">
    <div class="van-hairline--bottom">
      <van-field v-model="resultLabel" v-bind="$attrs" readonly :is-link="checkLink" error-message-align='right' input-align="left" @click="showPopu($attrs.disabled)"
        class="dh-cell">
        <template slot="right-icon" v-if="resultLabel&&supportClear">
          <img src="~@/assets/img/filedClear.png" alt="" @click.stop='clickClose' class="filedClear">
        </template>
      </van-field>
      <van-popup v-model="show" position="bottom" class="">
        <div class="van-picker__toolbar">
          <button type="button" class="van-picker__cancel" @click="cancel">取消</button>
          <div class="van-ellipsis van-picker__title">{{$attrs.label}}</div>
          <button type="button" class="van-picker__confirm" @click="onConfirm">确认</button>
        </div>
        <div class="checkbox-con" style="max-height:264px;overflow-y:auto">
          <van-field v-model="searchVal" placeholder="搜索" @input="search" v-if="isSearch" input-align="left" />
          <van-cell title="全选">
            <template #right-icon>
              <van-checkbox name="all" @click="toggleAll" v-model="checkedAll" />
            </template>
          </van-cell>
          <van-checkbox-group v-model="checkboxValue" @change="change" ref="checkboxGroup">
            <van-cell-group>
              <van-cell v-for="(item, index) in columnsData" clickable :key="item[option.value]" :title="item[option.label]" @click="toggle(index)">
                <template #right-icon>
                  <van-checkbox :name="item[option.value]" ref="checkboxes" />
                </template>
              </van-cell>
            </van-cell-group>
          </van-checkbox-group>
        </div>
      </van-popup>
    </div>
  </div>
</template>

<script>
export default {
  name: "VanFieldCheckbox",
  model: {
    prop: "selectValue",
  },
  props: {
    columns: {
      type: Array,
      default: function () {
        return [];
      },
    },
    supportClear: {
      type: Boolean,
      default: false,
    },
    selectValue: {
      type: Array,
      default: function () {
        return [];
      },
    },
    option: {
      type: Object,
      default: function () {
        return { label: "label", value: "value" };
      },
    },
    isSearch: {
      type: Boolean,
      default: false,
    },
  },
  computed: {
    resultLabel: {
      get() {
        const res = this.columns.filter((item) => {
          return this.resultValue.indexOf(item[this.option.value]) > -1;
        });
        const resLabel = res.map((item) => {
          return item[this.option.label];
        });
        return resLabel.join(",");
      },
      set() {},
    },
    checkLink() {
      let isLink = false;
      if (this.supportClear) {
        if (this.$attrs.disabled === undefined && !this.resultLabel) {
          isLink = true;
        } else {
          isLink = false;
        }
      } else {
        if (this.$attrs.disabled === undefined) {
          isLink = true;
        }
      }
      return isLink;
    },
  },
  data() {
    return {
      show: false,
      searchVal: "",
      columnsData: JSON.parse(JSON.stringify(this.columns)),
      checkboxValue: JSON.parse(JSON.stringify(this.selectValue)),
      checkedAll: false,
      resultValue: JSON.parse(JSON.stringify(this.selectValue)),
    };
  },
  methods: {
    clickClose(e) {
      this.resultValue = [];
      this.$emit("confirm", false);
    },
    search(val) {
      if (val) {
        this.columnsData = this.columnsData.filter((item) => {
          return item[this.option.label].indexOf(val) > -1;
        });
      } else {
        this.columnsData = JSON.parse(JSON.stringify(this.columns));
      }
    },
    getData(val) {
      const res = this.columnsData.filter((item) => {
        return val.indexOf(item[this.option.value]) > -1;
      });
      return res;
    },
    onConfirm() {
      this.resultValue = this.checkboxValue;
      this.show = !this.show;
      this.$emit("confirm", this.resultValue, this.getData(this.resultValue));
    },
    change(val) {
      this.$emit("change", val, this.getData(this.resultValue));
    },
    cancel() {
      this.show = !this.show;
      this.$emit("cancel", this.resultValue);
    },
    toggle(index) {
      this.$refs.checkboxes[index].toggle();
    },
    toggleAll(all) {
      this.$refs.checkboxGroup.toggleAll(this.checkedAll);
    },
    showPopu(disabled) {
      this.columnsData = JSON.parse(JSON.stringify(this.columns));
      this.checkboxValue = JSON.parse(JSON.stringify(this.selectValue));
      this.resultValue = JSON.parse(JSON.stringify(this.selectValue));
      if (disabled !== undefined && disabled !== false) {
        return false;
      } else {
        this.show = !this.show;
      }
    },
  },
  watch: {
    selectValue: function (newVal) {
      this.resultValue = newVal;
    },
    resultValue(val) {
      this.searchVal = "";
      this.columnsData = JSON.parse(JSON.stringify(this.columns));
      this.$emit("input", val);
    },
    columnsData: {
      handler(val) {
        if (val.length && val.length === this.checkboxValue.length) {
          this.checkedAll = true;
        } else {
          this.checkedAll = false;
        }
      },
      immediate: true,
    },
    checkboxValue: {
      handler(val) {
        if (val.length && val.length === this.columnsData.length) {
          this.checkedAll = true;
        } else {
          this.checkedAll = false;
        }
      },
      immediate: true,
    },
  },
};
</script>

<style lang="scss" scoped>
.dh-field {
  padding: 0 32px;
  background: #fff;
  .dh-cell.van-cell {
    padding: 10px 0;
  }
  .dh-cell.van-cell--required::before {
    left: -8px;
  }
  .van-popup {
    border-radius: 20px 20px 0 0;
  }
}
.filedClear {
  width: 32px;
  height: 32px;
}
</style>
